Petty Officer 3rd Class Cassidy Stevens and Petty Officer 3rd Class Collette Herrman, storekeepers aboard the Coast Guard Cutter Polar Star, have their rank insignia placed on their collars during an advancement ceremony held on the ice while ship is hove-to in the Ross Sea near Antarctica, Jan. 31, 2015. Polar Star's crew is underway in Support of Operation Deep Freeze 2015, part of the U.S. Antarctic program managed by the National Science Foundation. (U.S. Coast Guard photo by Petty Officer 1st Class George Degener)